1641181 has 4 divisors (see below), whose sum is σ = 1679392. Its totient is φ = 1602972.

The previous prime is 1641161. The next prime is 1641217. The reversal of 1641181 is 1811461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1641181 - 2⁷ = 1641053 is a prime.

It is a super-2 number, since 2×1641181² = 5386950149522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19041 + ... + 19126.

It is an arithmetic number, because the mean of its divisors is an integer number (419848).

2^1641181 is an apocalyptic number.

It is an amenable number.

1641181 is a deficient number, since it is larger than the sum of its proper divisors (38211).

1641181 is an equidigital number, since it uses as much as digits as its factorization.

1641181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38210.

The product of its digits is 192, while the sum is 22.

The square root of 1641181 is about 1281.0858675358. The cubic root of 1641181 is about 117.9556713700.

The spelling of 1641181 in words is "one million, six hundred forty-one thousand, one hundred eighty-one".